2 * Initialization routines
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/init.h>
23 #include <linux/sched.h>
24 #include <linux/module.h>
25 #include <linux/device.h>
26 #include <linux/file.h>
27 #include <linux/slab.h>
28 #include <linux/time.h>
29 #include <linux/ctype.h>
32 #include <sound/core.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
36 /* monitor files for graceful shutdown (hotplug) */
37 struct snd_monitor_file {
39 const struct file_operations *disconnected_f_op;
40 struct list_head shutdown_list; /* still need to shutdown */
41 struct list_head list; /* link of monitor files */
44 static DEFINE_SPINLOCK(shutdown_lock);
45 static LIST_HEAD(shutdown_files);
47 static const struct file_operations snd_shutdown_f_ops;
49 /* locked for registering/using */
50 static DECLARE_BITMAP(snd_cards_lock, SNDRV_CARDS);
51 struct snd_card *snd_cards[SNDRV_CARDS];
52 EXPORT_SYMBOL(snd_cards);
54 static DEFINE_MUTEX(snd_card_mutex);
56 static char *slots[SNDRV_CARDS];
57 module_param_array(slots, charp, NULL, 0444);
58 MODULE_PARM_DESC(slots, "Module names assigned to the slots.");
60 /* return non-zero if the given index is reserved for the given
61 * module via slots option
63 static int module_slot_match(struct module *module, int idx)
69 if (!module || !*module->name || !slots[idx])
75 match = 0; /* negative match */
78 /* compare module name strings
79 * hyphens are handled as equivalent with underscore
97 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
98 int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
99 EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
102 #ifdef CONFIG_PROC_FS
103 static void snd_card_id_read(struct snd_info_entry *entry,
104 struct snd_info_buffer *buffer)
106 snd_iprintf(buffer, "%s\n", entry->card->id);
109 static inline int init_info_for_card(struct snd_card *card)
112 struct snd_info_entry *entry;
114 if ((err = snd_info_card_register(card)) < 0) {
115 snd_printd("unable to create card info\n");
118 if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
119 snd_printd("unable to create card entry\n");
122 entry->c.text.read = snd_card_id_read;
123 if (snd_info_register(entry) < 0) {
124 snd_info_free_entry(entry);
127 card->proc_id = entry;
130 #else /* !CONFIG_PROC_FS */
131 #define init_info_for_card(card)
134 static int check_empty_slot(struct module *module, int slot)
136 return !slots[slot] || !*slots[slot];
139 /* return an empty slot number (>= 0) found in the given bitmask @mask.
140 * @mask == -1 == 0xffffffff means: take any free slot up to 32
141 * when no slot is available, return the original @mask as is.
143 static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int),
144 struct module *module)
148 for (slot = 0; slot < SNDRV_CARDS; slot++) {
149 if (slot < 32 && !(mask & (1U << slot)))
151 if (!test_bit(slot, snd_cards_lock)) {
152 if (check(module, slot))
153 return slot; /* found */
156 return mask; /* unchanged */
160 * snd_card_create - create and initialize a soundcard structure
161 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
162 * @xid: card identification (ASCII string)
163 * @module: top level module for locking
164 * @extra_size: allocate this extra size after the main soundcard structure
165 * @card_ret: the pointer to store the created card instance
167 * Creates and initializes a soundcard structure.
169 * The function allocates snd_card instance via kzalloc with the given
170 * space for the driver to use freely. The allocated struct is stored
171 * in the given card_ret pointer.
173 * Return: Zero if successful or a negative error code.
175 int snd_card_create(int idx, const char *xid,
176 struct module *module, int extra_size,
177 struct snd_card **card_ret)
179 struct snd_card *card;
182 if (snd_BUG_ON(!card_ret))
188 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
192 strlcpy(card->id, xid, sizeof(card->id));
194 mutex_lock(&snd_card_mutex);
195 if (idx < 0) /* first check the matching module-name slot */
196 idx = get_slot_from_bitmask(idx, module_slot_match, module);
197 if (idx < 0) /* if not matched, assign an empty slot */
198 idx = get_slot_from_bitmask(idx, check_empty_slot, module);
201 else if (idx < snd_ecards_limit) {
202 if (test_bit(idx, snd_cards_lock))
203 err = -EBUSY; /* invalid */
204 } else if (idx >= SNDRV_CARDS)
207 mutex_unlock(&snd_card_mutex);
208 snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n",
209 idx, snd_ecards_limit - 1, err);
212 set_bit(idx, snd_cards_lock); /* lock it */
213 if (idx >= snd_ecards_limit)
214 snd_ecards_limit = idx + 1; /* increase the limit */
215 mutex_unlock(&snd_card_mutex);
217 card->module = module;
218 INIT_LIST_HEAD(&card->devices);
219 init_rwsem(&card->controls_rwsem);
220 rwlock_init(&card->ctl_files_rwlock);
221 mutex_init(&card->user_ctl_lock);
222 INIT_LIST_HEAD(&card->controls);
223 INIT_LIST_HEAD(&card->ctl_files);
224 spin_lock_init(&card->files_lock);
225 INIT_LIST_HEAD(&card->files_list);
226 init_waitqueue_head(&card->shutdown_sleep);
227 atomic_set(&card->refcount, 0);
229 mutex_init(&card->power_lock);
230 init_waitqueue_head(&card->power_sleep);
232 /* the control interface cannot be accessed from the user space until */
233 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
234 err = snd_ctl_create(card);
236 snd_printk(KERN_ERR "unable to register control minors\n");
239 err = snd_info_card_create(card);
241 snd_printk(KERN_ERR "unable to create card info\n");
245 card->private_data = (char *)card + sizeof(struct snd_card);
250 snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
255 EXPORT_SYMBOL(snd_card_create);
257 /* return non-zero if a card is already locked */
258 int snd_card_locked(int card)
262 mutex_lock(&snd_card_mutex);
263 locked = test_bit(card, snd_cards_lock);
264 mutex_unlock(&snd_card_mutex);
268 static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
273 static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
274 size_t count, loff_t *offset)
279 static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
280 size_t count, loff_t *offset)
285 static int snd_disconnect_release(struct inode *inode, struct file *file)
287 struct snd_monitor_file *df = NULL, *_df;
289 spin_lock(&shutdown_lock);
290 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
291 if (_df->file == file) {
293 list_del_init(&df->shutdown_list);
297 spin_unlock(&shutdown_lock);
300 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
301 df->disconnected_f_op->fasync(-1, file, 0);
302 return df->disconnected_f_op->release(inode, file);
305 panic("%s(%p, %p) failed!", __func__, inode, file);
308 static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
310 return POLLERR | POLLNVAL;
313 static long snd_disconnect_ioctl(struct file *file,
314 unsigned int cmd, unsigned long arg)
319 static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
324 static int snd_disconnect_fasync(int fd, struct file *file, int on)
329 static const struct file_operations snd_shutdown_f_ops =
331 .owner = THIS_MODULE,
332 .llseek = snd_disconnect_llseek,
333 .read = snd_disconnect_read,
334 .write = snd_disconnect_write,
335 .release = snd_disconnect_release,
336 .poll = snd_disconnect_poll,
337 .unlocked_ioctl = snd_disconnect_ioctl,
339 .compat_ioctl = snd_disconnect_ioctl,
341 .mmap = snd_disconnect_mmap,
342 .fasync = snd_disconnect_fasync
346 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
347 * @card: soundcard structure
349 * Disconnects all APIs from the file-operations (user space).
351 * Return: Zero, otherwise a negative error code.
353 * Note: The current implementation replaces all active file->f_op with special
354 * dummy file operations (they do nothing except release).
356 int snd_card_disconnect(struct snd_card *card)
358 struct snd_monitor_file *mfile;
364 spin_lock(&card->files_lock);
365 if (card->shutdown) {
366 spin_unlock(&card->files_lock);
370 spin_unlock(&card->files_lock);
372 /* phase 1: disable fops (user space) operations for ALSA API */
373 mutex_lock(&snd_card_mutex);
374 snd_cards[card->number] = NULL;
375 clear_bit(card->number, snd_cards_lock);
376 mutex_unlock(&snd_card_mutex);
378 /* phase 2: replace file->f_op with special dummy operations */
380 spin_lock(&card->files_lock);
381 list_for_each_entry(mfile, &card->files_list, list) {
382 /* it's critical part, use endless loop */
383 /* we have no room to fail */
384 mfile->disconnected_f_op = mfile->file->f_op;
386 spin_lock(&shutdown_lock);
387 list_add(&mfile->shutdown_list, &shutdown_files);
388 spin_unlock(&shutdown_lock);
390 mfile->file->f_op = &snd_shutdown_f_ops;
391 fops_get(mfile->file->f_op);
393 spin_unlock(&card->files_lock);
395 /* phase 3: notify all connected devices about disconnection */
396 /* at this point, they cannot respond to any calls except release() */
398 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
399 if (snd_mixer_oss_notify_callback)
400 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
403 /* notify all devices that we are disconnected */
404 err = snd_device_disconnect_all(card);
406 snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
408 snd_info_card_disconnect(card);
409 if (card->card_dev) {
410 device_unregister(card->card_dev);
411 card->card_dev = NULL;
414 wake_up(&card->power_sleep);
419 EXPORT_SYMBOL(snd_card_disconnect);
422 * snd_card_free - frees given soundcard structure
423 * @card: soundcard structure
425 * This function releases the soundcard structure and the all assigned
426 * devices automatically. That is, you don't have to release the devices
429 * Return: Zero. Frees all associated devices and frees the control
430 * interface associated to given soundcard.
432 static int snd_card_do_free(struct snd_card *card)
434 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
435 if (snd_mixer_oss_notify_callback)
436 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
438 if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) {
439 snd_printk(KERN_ERR "unable to free all devices (pre)\n");
440 /* Fatal, but this situation should never occur */
442 if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) {
443 snd_printk(KERN_ERR "unable to free all devices (normal)\n");
444 /* Fatal, but this situation should never occur */
446 if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) {
447 snd_printk(KERN_ERR "unable to free all devices (post)\n");
448 /* Fatal, but this situation should never occur */
450 if (card->private_free)
451 card->private_free(card);
452 snd_info_free_entry(card->proc_id);
453 if (snd_info_card_free(card) < 0) {
454 snd_printk(KERN_WARNING "unable to free card info\n");
455 /* Not fatal error */
462 * snd_card_unref - release the reference counter
463 * @card: the card instance
465 * Decrements the reference counter. When it reaches to zero, wake up
466 * the sleeper and call the destructor if needed.
468 void snd_card_unref(struct snd_card *card)
470 if (atomic_dec_and_test(&card->refcount)) {
471 wake_up(&card->shutdown_sleep);
472 if (card->free_on_last_close)
473 snd_card_do_free(card);
476 EXPORT_SYMBOL(snd_card_unref);
478 int snd_card_free_when_closed(struct snd_card *card)
482 atomic_inc(&card->refcount);
483 ret = snd_card_disconnect(card);
485 atomic_dec(&card->refcount);
489 card->free_on_last_close = 1;
490 if (atomic_dec_and_test(&card->refcount))
491 snd_card_do_free(card);
495 EXPORT_SYMBOL(snd_card_free_when_closed);
497 int snd_card_free(struct snd_card *card)
499 int ret = snd_card_disconnect(card);
503 /* wait, until all devices are ready for the free operation */
504 wait_event(card->shutdown_sleep, !atomic_read(&card->refcount));
505 snd_card_do_free(card);
509 EXPORT_SYMBOL(snd_card_free);
511 /* retrieve the last word of shortname or longname */
512 static const char *retrieve_id_from_card_name(const char *name)
514 const char *spos = name;
517 if (isspace(*name) && isalnum(name[1]))
524 /* return true if the given id string doesn't conflict any other card ids */
525 static bool card_id_ok(struct snd_card *card, const char *id)
528 if (!snd_info_check_reserved_words(id))
530 for (i = 0; i < snd_ecards_limit; i++) {
531 if (snd_cards[i] && snd_cards[i] != card &&
532 !strcmp(snd_cards[i]->id, id))
538 /* copy to card->id only with valid letters from nid */
539 static void copy_valid_id_string(struct snd_card *card, const char *src,
544 while (*nid && !isalnum(*nid))
547 *id++ = isalpha(*src) ? *src : 'D';
548 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
556 /* Set card->id from the given string
557 * If the string conflicts with other ids, add a suffix to make it unique.
559 static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
563 bool is_default = false;
566 copy_valid_id_string(card, src, nid);
570 /* use "Default" for obviously invalid strings
571 * ("card" conflicts with proc directories)
573 if (!*id || !strncmp(id, "card", 4)) {
574 strcpy(id, "Default");
579 for (loops = 0; loops < SNDRV_CARDS; loops++) {
581 char sfxstr[5]; /* "_012" */
584 if (card_id_ok(card, id))
587 /* Add _XYZ suffix */
588 sprintf(sfxstr, "_%X", loops + 1);
589 sfxlen = strlen(sfxstr);
590 if (len + sfxlen >= sizeof(card->id))
591 spos = id + sizeof(card->id) - sfxlen - 1;
594 strcpy(spos, sfxstr);
596 /* fallback to the default id */
602 snd_printk(KERN_ERR "unable to set card id (%s)\n", id);
603 if (card->proc_root->name)
604 strlcpy(card->id, card->proc_root->name, sizeof(card->id));
608 * snd_card_set_id - set card identification name
609 * @card: soundcard structure
610 * @nid: new identification string
612 * This function sets the card identification and checks for name
615 void snd_card_set_id(struct snd_card *card, const char *nid)
617 /* check if user specified own card->id */
618 if (card->id[0] != '\0')
620 mutex_lock(&snd_card_mutex);
621 snd_card_set_id_no_lock(card, nid, nid);
622 mutex_unlock(&snd_card_mutex);
624 EXPORT_SYMBOL(snd_card_set_id);
627 card_id_show_attr(struct device *dev,
628 struct device_attribute *attr, char *buf)
630 struct snd_card *card = dev_get_drvdata(dev);
631 return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)");
635 card_id_store_attr(struct device *dev, struct device_attribute *attr,
636 const char *buf, size_t count)
638 struct snd_card *card = dev_get_drvdata(dev);
639 char buf1[sizeof(card->id)];
640 size_t copy = count > sizeof(card->id) - 1 ?
641 sizeof(card->id) - 1 : count;
645 for (idx = 0; idx < copy; idx++) {
647 if (!isalnum(c) && c != '_' && c != '-')
650 memcpy(buf1, buf, copy);
652 mutex_lock(&snd_card_mutex);
653 if (!card_id_ok(NULL, buf1)) {
654 mutex_unlock(&snd_card_mutex);
657 strcpy(card->id, buf1);
658 snd_info_card_id_change(card);
659 mutex_unlock(&snd_card_mutex);
664 static struct device_attribute card_id_attrs =
665 __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr);
668 card_number_show_attr(struct device *dev,
669 struct device_attribute *attr, char *buf)
671 struct snd_card *card = dev_get_drvdata(dev);
672 return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1);
675 static struct device_attribute card_number_attrs =
676 __ATTR(number, S_IRUGO, card_number_show_attr, NULL);
679 * snd_card_register - register the soundcard
680 * @card: soundcard structure
682 * This function registers all the devices assigned to the soundcard.
683 * Until calling this, the ALSA control interface is blocked from the
684 * external accesses. Thus, you should call this function at the end
685 * of the initialization of the card.
687 * Return: Zero otherwise a negative error code if the registration failed.
689 int snd_card_register(struct snd_card *card)
693 if (snd_BUG_ON(!card))
696 if (!card->card_dev) {
697 card->card_dev = device_create(sound_class, card->dev,
699 "card%i", card->number);
700 if (IS_ERR(card->card_dev))
701 card->card_dev = NULL;
704 if ((err = snd_device_register_all(card)) < 0)
706 mutex_lock(&snd_card_mutex);
707 if (snd_cards[card->number]) {
708 /* already registered */
709 mutex_unlock(&snd_card_mutex);
713 /* make a unique id name from the given string */
714 char tmpid[sizeof(card->id)];
715 memcpy(tmpid, card->id, sizeof(card->id));
716 snd_card_set_id_no_lock(card, tmpid, tmpid);
718 /* create an id from either shortname or longname */
720 src = *card->shortname ? card->shortname : card->longname;
721 snd_card_set_id_no_lock(card, src,
722 retrieve_id_from_card_name(src));
724 snd_cards[card->number] = card;
725 mutex_unlock(&snd_card_mutex);
726 init_info_for_card(card);
727 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
728 if (snd_mixer_oss_notify_callback)
729 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
731 if (card->card_dev) {
732 err = device_create_file(card->card_dev, &card_id_attrs);
735 err = device_create_file(card->card_dev, &card_number_attrs);
743 EXPORT_SYMBOL(snd_card_register);
745 #ifdef CONFIG_PROC_FS
746 static struct snd_info_entry *snd_card_info_entry;
748 static void snd_card_info_read(struct snd_info_entry *entry,
749 struct snd_info_buffer *buffer)
752 struct snd_card *card;
754 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
755 mutex_lock(&snd_card_mutex);
756 if ((card = snd_cards[idx]) != NULL) {
758 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
763 snd_iprintf(buffer, " %s\n",
766 mutex_unlock(&snd_card_mutex);
769 snd_iprintf(buffer, "--- no soundcards ---\n");
772 #ifdef CONFIG_SND_OSSEMUL
774 void snd_card_info_read_oss(struct snd_info_buffer *buffer)
777 struct snd_card *card;
779 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
780 mutex_lock(&snd_card_mutex);
781 if ((card = snd_cards[idx]) != NULL) {
783 snd_iprintf(buffer, "%s\n", card->longname);
785 mutex_unlock(&snd_card_mutex);
788 snd_iprintf(buffer, "--- no soundcards ---\n");
795 static struct snd_info_entry *snd_card_module_info_entry;
796 static void snd_card_module_info_read(struct snd_info_entry *entry,
797 struct snd_info_buffer *buffer)
800 struct snd_card *card;
802 for (idx = 0; idx < SNDRV_CARDS; idx++) {
803 mutex_lock(&snd_card_mutex);
804 if ((card = snd_cards[idx]) != NULL)
805 snd_iprintf(buffer, "%2i %s\n",
806 idx, card->module->name);
807 mutex_unlock(&snd_card_mutex);
812 int __init snd_card_info_init(void)
814 struct snd_info_entry *entry;
816 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
819 entry->c.text.read = snd_card_info_read;
820 if (snd_info_register(entry) < 0) {
821 snd_info_free_entry(entry);
824 snd_card_info_entry = entry;
827 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
829 entry->c.text.read = snd_card_module_info_read;
830 if (snd_info_register(entry) < 0)
831 snd_info_free_entry(entry);
833 snd_card_module_info_entry = entry;
840 int __exit snd_card_info_done(void)
842 snd_info_free_entry(snd_card_info_entry);
844 snd_info_free_entry(snd_card_module_info_entry);
849 #endif /* CONFIG_PROC_FS */
852 * snd_component_add - add a component string
853 * @card: soundcard structure
854 * @component: the component id string
856 * This function adds the component id string to the supported list.
857 * The component can be referred from the alsa-lib.
859 * Return: Zero otherwise a negative error code.
862 int snd_component_add(struct snd_card *card, const char *component)
865 int len = strlen(component);
867 ptr = strstr(card->components, component);
869 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
872 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
876 if (card->components[0] != '\0')
877 strcat(card->components, " ");
878 strcat(card->components, component);
882 EXPORT_SYMBOL(snd_component_add);
885 * snd_card_file_add - add the file to the file list of the card
886 * @card: soundcard structure
887 * @file: file pointer
889 * This function adds the file to the file linked-list of the card.
890 * This linked-list is used to keep tracking the connection state,
891 * and to avoid the release of busy resources by hotplug.
893 * Return: zero or a negative error code.
895 int snd_card_file_add(struct snd_card *card, struct file *file)
897 struct snd_monitor_file *mfile;
899 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
903 mfile->disconnected_f_op = NULL;
904 INIT_LIST_HEAD(&mfile->shutdown_list);
905 spin_lock(&card->files_lock);
906 if (card->shutdown) {
907 spin_unlock(&card->files_lock);
911 list_add(&mfile->list, &card->files_list);
912 atomic_inc(&card->refcount);
913 spin_unlock(&card->files_lock);
917 EXPORT_SYMBOL(snd_card_file_add);
920 * snd_card_file_remove - remove the file from the file list
921 * @card: soundcard structure
922 * @file: file pointer
924 * This function removes the file formerly added to the card via
925 * snd_card_file_add() function.
926 * If all files are removed and snd_card_free_when_closed() was
927 * called beforehand, it processes the pending release of
930 * Return: Zero or a negative error code.
932 int snd_card_file_remove(struct snd_card *card, struct file *file)
934 struct snd_monitor_file *mfile, *found = NULL;
936 spin_lock(&card->files_lock);
937 list_for_each_entry(mfile, &card->files_list, list) {
938 if (mfile->file == file) {
939 list_del(&mfile->list);
940 spin_lock(&shutdown_lock);
941 list_del(&mfile->shutdown_list);
942 spin_unlock(&shutdown_lock);
943 if (mfile->disconnected_f_op)
944 fops_put(mfile->disconnected_f_op);
949 spin_unlock(&card->files_lock);
951 snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
955 snd_card_unref(card);
959 EXPORT_SYMBOL(snd_card_file_remove);
963 * snd_power_wait - wait until the power-state is changed.
964 * @card: soundcard structure
965 * @power_state: expected power state
967 * Waits until the power-state is changed.
969 * Return: Zero if successful, or a negative error code.
971 * Note: the power lock must be active before call.
973 int snd_power_wait(struct snd_card *card, unsigned int power_state)
979 if (snd_power_get_state(card) == power_state)
981 init_waitqueue_entry(&wait, current);
982 add_wait_queue(&card->power_sleep, &wait);
984 if (card->shutdown) {
988 if (snd_power_get_state(card) == power_state)
990 set_current_state(TASK_UNINTERRUPTIBLE);
991 snd_power_unlock(card);
992 schedule_timeout(30 * HZ);
993 snd_power_lock(card);
995 remove_wait_queue(&card->power_sleep, &wait);
999 EXPORT_SYMBOL(snd_power_wait);
1000 #endif /* CONFIG_PM */